Woman to face court over murder of Sydney teen

A woman charged with the murder of a Sydney teenager is expected to face court after she was arrested on what would have been his 16th birthday.

The 30-year-old was apprehended at Blacktown, in the city's west, on Wednesday afternoon - what would have been the boy's birthday.

It came a day after homicide detectives charged 26-year-old Conrad Craig with the teen's murder in the first major breakthrough since the incident in April.

The 15-year-old was allegedly shot at close range in his bed after a masked intruder smashed his way into the family's Glenfield home.

The woman will face Blacktown Local Court on Thursday, while Crag's matter was on Tuesday adjourned until August 23.

The second arrest came as the boy's family and friends prepared to mark what would have been his 16th birthday at a well-known footbridge in East Hills.

They sang Happy Birthday and released helium balloons on the bridge, which has become an unofficial meeting spot for those struggling to come to terms with the sudden death.

Photos, flowers, balloons and messages of support now cover sections of the bridge.